flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'git+https://github.com/NixOS/nixpkgs?ref=nixos-unstable-small&rev=f55926cd4adb4db12ca97a86bc4e48e2c213f4d9&shallow=1' (2025-03-26)
  → 'git+https://github.com/NixOS/nixpkgs?ref=nixos-unstable-small&rev=8b1bcd4edc0de0a950eb117a37c55294997588b5&shallow=1' (2025-03-27)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/61c88349bf6dff49fa52d7dfc39b21026c2a8881?narHash=sha256-aRA6LSxjlbMI6MmMzi/M5WH/ynd8pK%2BvACD9za3MKLQ%3D' (2025-03-26)
  → 'github:numtide/treefmt-nix/29a3d7b768c70addce17af0869f6e2bd8f5be4b7?narHash=sha256-WRAylyYptt6OX5eCEBWyTwOEqEtD6zt33rlUkr6u3cE%3D' (2025-03-27)

Author: zowoq